The Lions Defiant are a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records. In 992999.M41, a massive event known as the Night of a Thousand Rebellions occurred. Uprisings and discord struck countless planets across the Imperium. Unrest raced like wildfire, consuming many outlying planets, but also supposedly secure worlds like Enceladus, Darkhold, and Minisotira. Contact was lost with large swathes of Segmentum Pacificus. Even the homeworld of the Lions Defiant Space Marine Chapter was lost to the anarchy caused by the coordinated activity of secret cults and frenetic agitators.
- The Night of a Thousand Rebellions (992999.M41) - Carefully seeded and stoked by Chaos forces, hundreds of uprisings all broke out on a single night across Segmentum Pacificus. Imperial worlds thought impervious to unrest were beset by mass violence. Even the Lions Defiant found their homeworld the victim of insurgent activity. Contact was lost with large swathes of the Segmentum as Chaos Space Marine forces moved in to take advantage of the discord they had orchestrated.
The Lions Defiant's Chapter colours are not listed in current Imperial records.
The Lions Defiant's Chapter badge is not listed in current Imperial records.
- Warhammer 40,000 Rulebook (6th Edition), pg. 177